The radio button is a form element comprising a series of items that make a list of options that allow the user to select options that are mutually exclusive of each other. Users may only select a single radio button within a series of items that make a list.
Use radio buttons when you want users to see all available multual exclusive options and the list of options is small.
Use radio buttons for six or fewer options.
Use a select box for more than six options, or a datalist for more than 13 options. Both prompt users to disclose the options.
Radio buttons are available in vertical, horizontal, and compact layout. See more layout guidelines on the form page.